For what it’s worth I managed to get in. If you stick a long flathead screwdriver between the passenger seat and the rider seat, and kind of drag it from right to left, you’ll catch the latch mechanism and the seat will pop off. The dealer wanted to charge nearly $200 an hour to look at it…
I can see down to the lock and the cable did indeed just pop out of its spot. I’ll need to figure out the best way to get down in there and re-seat the cable.